Electric switch.



No. 789,867 PATENTED MAY 9, 1905. H. F. KEIL.

ELECTRIC SWITCH.

APPLICATION FILED JULY 19. 1904.

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Inve 71 to 7;

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Witnesses.- fl/wwm fi- Patented May 9, 1905.

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' HEN-RY FRANCIS KEIL, OF BRONXVILLE, NEW YORK.

ELECTRIC SWllTCl-l.

SPECIFICATION forming part of Letters Patent No. 789,367, dated May 9, 1905.

Application filed July 19, 1904. derial No. 217,193.

To all 'lh'hU/IL it may concern:

Be it known that I, H ENRY FnANoIs KEIL, a citizen of the United States of America, and a resident of Bronxville, in the county of VVestchester and State of New York, have invented a certain new and useful Electric Switch, of which the following is a specification,the same being a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to mechanicaldevices for shifting a current of electricity from one course or wire to another, in making or breaking a circuit, and in particular to means for preventing the arms or levers and also the knob carried thereby from working loose by reason of the continued use of the same; and it has for its object the production of a structure simple in construction, inexpensive to manufacture, and efficient in practical use.

To attain the desired end, the invention consists in certain'novel features of construction and combination and arangement of parts, allof which will be hereinafterdescribed, and specifically pointed out in the drawings which accompany and form a part of this specilication, in which Figure 1 represents a plan view of a switch constructed according to my invention. Fig. 2 is a section of the same, taken on the line 2 2, Fig. 1. Figs. 3 to 6 are views in detail of the washer, lever, screw, and knob used in the switch; and Figs. 3, 7, S, 9, and 10 are views in detail of other forms of washers, handles, and knobs embodying my invention.

Like letters of reference indicate like parts in all the views.

Referring particularly to the drawings, A denotes the block or base-plate, upon which my switch is mounted. B is the switch-arm. L- (l are stops to determine the swing or latoral movement of the switch arm or lever. B is the knob carried by the switch-arm, and E is the screw by means of which the said switch-arm is secured in a movable relation to the said block or base-plate A.

The shank c of the screw E is made of irregular shape, as by being formed with the squared-out lips or lugs (2, and the washer F is constructed with a central orificefand recessesf to register with the said lips or lugs c. The switch arm or lever B is made with an orifice b and recesses 7) to also register with the lips or lugs c of the screw E.

The screw E is passed through the orifices of the switch-arm B and washer F and then inserted and immovably embedded in the base plate or block A and fastened thereto by the nuts G G, the arm B being held securely to the block A in a movable relation, while the screw E, on account of the projections on the shank forcing aside the fibers of the wood, will never work loose or turn in any direction no matter how long or often the said switch-arm is operated.

The orifice of the washer F may be made of different forms or contours, as the orifices fif of the washers F and F, (shown in Figs.

3 3",) and in cases where orifices of such forms are used the body or shank of the screw 1*] is made of such irregular shape as to conform to and register therewith.

1 also provide means whereby the knob 1.) cannot work loose on the switch arm or lever B, as in the present embodiment, by forming in the outer end of the said arm B a ridge or projection 7) to register and engage with a groove or recess (Z in the knob I) when the said knob is rigidly fastened to the said switcharm by means of the screw ll, which passes through the latter and enters the knob I).

If preferred, a plurality of indentions or spurs, as 71 in Fig. 7 and if in Figs. 8 and 9, may be formed in the end of the switch arm or lever B to register and engage with the orifices (.Z of the knob D and the orifices 2 of the knob D, by which means when the knob is once screwed fast to the switch-arm it can never work loose even after the said knob has been operated for years.

As it is evident that many changes in the construction, form, n'oportion, and relative arrangement of parts might be resorted to without departing from the spirit and scope of my invention, I would have it understood that I. do not restrict myself to the particular construction and arrangt-nnent of parts shown and described, but that such changes and equivalents may be substituted therefor, and that What I claim as my invention is- 1. In an electric switch, a base, a switch arm or lever, an intermediate washer and a screw formed with an irregular shank, the washer and switch-arm having orilices to register with the irregular shank of the screw.

2. In an electric switch, a base, a switch arm or lever and a screw the shank of which is formed with projecting portions, whereby the switch arm or lever is movably secured upon and the screw is immovably embedded in the said base, in combination with engaging means formed near the end of the said switch arm, and a knob having engaging means to coact therewith, whereby the knob may be secured to the switch-arn1 without danger of the same working loose.

In testimony of the foregoing specification I do hereby sign the same, in the city of New York, county and State of New York, this 26th day of June, 1904.

HENRY FRANCIS KEIL. Witnesses:

DIEDRIGH STEGEN, CHAS. H. J. DILG. 

